1. Wolfson Unit of Clinical Pharmacology, University of Newcastle upon Tyne, Newcastle NE2 4HH
2. Queen Elizabeth Hospital, Sheriff Hill, Gateshead NE9 6SX
3. Newcastle General Hospital, Westgate Rd, Newcastle NE4 6BE
4. Middlesbrough General Hospital, Ayresome Green Lane, Middlesbrough TS5 5AZ
5. Sunderland District General Hospital, Kayll Rd, Sunderland SR4 7TP
6. Dryburn Hospital, North Road, Durham DH1 5TW
7. Royal Victoria Infirmary, Queen Victoria Road, Newcastle NE1 4LP, UK